Apparatus for the production of molten liquid, coats of enamel, glass, and the like by spraying upon metal, stone, or other surfaces or bodies



K L'S LTEN LIQUID, coATs 0F AND THE LIKE BY SPRAYING UPON prl 29, 3.930. A. PAHL APPARATUS FOR THE PRODUCTION OF MO ENAMEL, GLASS,

METAL, STONE, R OTHER SURFACES OR BODIES Original Filed Jan. 28, 1927 Patented Apr. 2,9, 1930 UNITED sr-ArEsfrATENr OFFICE AUGUST PARI', 0F BERLIN-WILMERBDORF, GERMANY APPARATUS :vorl THE lnaomrcfrIoN or iuoL'rEN LIoUrncoArsor ENAMEL, eLAss, AND 'rua Lrxa isvwllrnavnwfy UroN METAL, asrro'am, on. eraan sUnrAcEs on BODIES Uriginal application med llanuary 28d, 1927, SerialA No. 164,827, and in Germany February 25, 198B. Divided and this application led June 25, 1927. Serial No.-'201,495.

It is already known to aply coatings'of enamel, glass, quartz or the li e in liquid form to various materials, for example, metal, by subjecting the coating material, for example,

enamel, in the form of a powder to the action of a flame in which it is melted, and then blowing the coating material in a molten state through the lamp itself on to the object to be coated. ff

The known processes, however, are open to objection due mostly to the fact that the material blown on in a molten condition does not adhere compactly to the previously warmed surface to which it is applied but forms a coating which is porous in places, so that a subseq1ent heating is nearly always necessa Y rlhe lolliject of the present invention is to provide apparatus for carrying out my improved rocess which is described and claimed 1n my copending application for Letters hatent of the United States, filed January 28, 1927, Serial Number 164,327, of which this specification is a division, and to enable powdered material in its unmelted condition, that is to say while still inthe form of a powder, to be blown by the blow flame on to previously warmed portions of the object -to be coated in accordance with my said 3 process.

The accompanying` drawing is a sectional View of an apparatus constructed and arranged in accordance with this invention and for carrying out the said process, Referring to the drawing, 1 isa mixing chamber having a tube 2 for the supply of v gas andan air pipe 3 arranged concentrically i side the mixing chamber, compressed air /being led to this air pipe 3 through the tubey o arran ed in the pistol shaped butt 4, the quantity o air being regulate by a valve or rock 6. The attachment for turning the valve 6 is arranged on the side of the butt 4, but for the sake of simplicity is not shown on the drawing. The outer end of the tube forming the mixing chamber or burner l is partly closed and has an opening 19 so that said outer end forms a nozzle. v Concentrically disposed with regard to the 5 pipe 3 and of such diameter as to leave a` tainer 12 which is firmly secured to the butt 4 and. holds the spraying material. The compressed air enters the container laterally through the openings 13 which are screened oif by a plate 14, passes through the mixture in the container 12, carries away a portion and leads this portion through the perforations in a tube 16 which is enclosed in a cover 15, into the tube 17, and from there into the discharge pipe 18 arranged concentrically in 70 L the tube 7, This matter mixed with compressed air thus passes through the Haine burning at the opening 19 of the mixing chamber -1 ata/high velocity, without becoming unduly heated, that is to say, without becoming plastic or even liquid. The quantity ofthe material as also its discharge velocity \can.be regulated by adjusting the tap 10, so

that the compressed air can either be led completely through the tube 8 along the channel 11 into the container 12 in order to carry away the material, or one portion of the compressed air led into the channel 11, and, another portion of the compressed air into the channel 9, so that the mixed current discharging through the pipe 18 is uniformly jacketed by a current of compressed air passing through the channel and along the tube 7, and is thereby further protected from the effect of the lame.

In order that the preliminary heating of the surface to be treated may/be effected rapidly Witho t the blow flame having to be first playe for a long time over a certain portion of the surface without any material being introduced, preliminar warmin means for example, a series of urners or coating a fairly large surface) can be inserted in front of the actual blow flame, thus rendering it possible to obtain an easier equalization of- 100 -in a circle) the ames of which cover one and the same part of the object to be coated, While the coating material is blown on to the same part by a currentl lying concentrically in the axis of the blow iames.

When it is desired to coat a larger amount of surface at the same time, the blow flames e can be arranged in several series alongside or below each other.

,Having thus described my invention, what I claim is:

n 1. Apparatus of the class described, comprising acontainer, a duct to discharge pow-` der from-the container, said duct having an intake end at an elevated point in the containtube, a valvefor controlling said last named compressed air duct, a burner tube surrounding the tubes before referred to and forming a mixing chamber therearoun said burner tube having an inlet for gas and also having a mixture discharging burner opening to which the discharge ends of the irst, second and third named tubes are presented.

In witness whereof I aiiix m signature. AUGUgT PAI-IL.

er and-above the level of the powdered mav terial inthe container, a burner tube in which the discharge end of the rst named duct is arranged, said burner tube having a gas intake and also having a discharge opening, a

duct for compressed air leading to the lower portion of said container and provided with a controlling valve, a duct in the burner tube arranged around and spaced from the discharge portion of the first named duct and a duct for compressed air leading to the inner end of the last named duct, the discharge ends of the last named duct and of the powder discharge duct being opposite the discharge, burner opening, of said burner tube.

2. Apparatus as claimed in claim 1, including a duct leading from the first named compressed air duct and an intermediate duct vbetween said concentric with the discharge portion of the powder discharge duct and the last named duct and to which intermediate duct the said duct which leads from the rst named compressed air duct discharges and also including a valve to control both the first named compressed air duct and the said duct which leads therefrom tothe intermediate duct.

3. Apparatus for the production of molten liquid coats of enamel, glass, quartz and-the like upon metal, stone or other surfaces, comprising a chamber for containing the coating material in powder form, a handle carrying said chamber, and having a duct for cornpressed air, said duct communicating with said chamber a burner tube extending from said handle, a tube extending longitudinally of said chamber, and having perforations at its outer end, said tube discharging into said burner tube, a valve controlling the passage of the air to said chamber, a second duct in said handle controlled by said valve, a tube connected to said second duct, a third tube surrounding said second tube, a compressed air duct in said handle connected to said third 

